NTRK1 and glioblastoma: Our pathway analysis (Table 2) shows that miR-21-5p is strongly involved in several pathways such as the Ras, NTRK, bone morphogenic protein, receptor tyrosine kinase, MET/PI3K/AKT, and fibroblast growth factor receptor pathways, which have already been associated with GBM [55,56,57].